East Side level:
Score 50,000 points in the Chinatown level in Kaos mode.

Corporation Central level:
Score 100,000 points in the East Side level in Kaos mode.

Last Clone Standing levels:
Successfully complete the three minute and five minute versions of a level to unlock the Last Clone Standing version of that map in Kaos mode.

Use head as a weapon:
Enable the "Punches decapitate" code then punch and kill someone. Pick up his or her head to use it as a weapon.

Defeating ATO guards:
While in Revolution mode, drop your weapon before moving past an ATO guard. They will ignore you if you are not causing problems and have no weapon. You can usually find another weapon replacement later.

Unlock Weapons
During a game, enter any of the following codes to unlock the corresponding weapon. If you entered the code correctly, you'll automatically be equiped with the unlocked weapon.